[Rails] accepts_nested_attributes_for how, example

I have following tables with following models:
       users(id, role_id) has_many :entries
       categories(id, category_name) has_many :entries
       entries(id, category_id, user_id)  belongs_to :user, belongs_to :category, has_one :storage
       storages(id, title, content, entry_id) belongs_to :entry, has_one :vote
       votes(id, count, storage_id) belongs_to :storage

Now, when user create new entry(through form) few things must happen:
      - New row in entry table will be created(with already existing user_id and category_id)
      - New row in storages table will be created(title and content of the post with above entry_id)
      - New row in votes table(with above storage_id, count is default 0)

Form for creating new entry have, combo box for selecting category(like: "Pictures", "Movies", etc), text box for title and text-area for content.

I followed many tutorials and documentation like:
http://railscasts.com/episodes/196-nested-model-form-part-1 and
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for
but can't get it how to work.

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